High molecular weight soft segment based polyethylene shape memory polymers

Manzoor Ahmad, Jikui Luo, Ben Xu, Hendra Purnawali, Peter King, Paul Chalker, Yong Qing Fu, Wei Min Huang, Mohsen Miraftab

Research output: Contribution to journalArticlepeer-review

Abstract

Shape memory polyurethanes (SMPUs) are typically synthesized using polyols of low molecular weight, Mw, and high hydroxyl number as it is believed that high density of cross-links in these polyols are essential for high performance shape memory polymers. In this study, polyethylene glycol (PEG-6000) with Mw ~ 6000 g/mol and low hydroxyl number (OH ~ 18 mg K OH/g) as the soft segment and diisocyanate as the hard segment were used to synthesize SMPUs. It revealed that although the PEG-6000 based SMPUs have lower maximum elongation at break (425%) and recovery stress than those of PCL-2000 polyol based SMPUs, they have much better shape recovery ratio (98%) and shape fixity (95%). Furthermore, these SMPUs showed a much shorter actuation time of <10sec for up to 85% shape recovery, much shorter than those low Mw SMPUs, clearly demonstrated their great potential for applications.
Original languageEnglish
Pages (from-to)179-186
JournalWorld Journal of Engineering
Volume9
Issue number3
DOIs
Publication statusPublished - 29 Jun 2012

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